Anyone have some info on the UltraAnalog DEMO 1 Board?

stellavox · 10:08 AM

In addition to their well-regarded D20400 DAC module, UltraAnalog also made other A/D modules including an AFE20048 Analog Front End and D20C10 "Decimator". They also made a DEMO 1 board to mount these on - and "play with".

I came across the DEMO board and wish to continue "playing". Anyone out there have any info on these other chips or the DEMO board? I've tried searching the web but as others have mentioned; after being sold to Wadia, the company disappeared.

Thank You

Charles

abraxalito · 25th May 2012, 04:46 PM

I have some of the chip sets (4 sets I think), but no schematic. There's the front-end chip (not a module), the decimator IC and some 0.01% resistor networks. PM me if interested.

stellavox · 26th May 2012, 12:04 PM

Was able to get the A/D board going - now to figure out what to do with it. Has AES and SPDIF digital outputs along with an analog "monitor" output from a D20400 D/A module. Unit was from the Chesky studio.

Charles

nat8808 · 1st January 2013, 08:02 PM

Wadia produced an A/D studio unit at around the time they bought out Ultraanalog - have seen one on ebay a little while ago.

Dan Lavry designed the UltraAnalog stuff - his own company. He MAY be willing to help you out perhaps - he should be contactable via Lavry Engineering website and he also used the gearslutz.com forum sometimes as himself.

Interesting bits it sounds like you have. I imagine Chesky Studios would have some very interesting kit, some bespoke/experiemental in the quest for sound quality. Probably a great sounding A/D for recording if now a little limited in format.

abraxalito · 2nd January 2013, 12:07 AM

Chesky's A/D sucks - introduces noise modulation. I didn't notice this until I built my own NOS DAC but now its very obvious on their 'Ultimate Demonstration Disc' - the announcer's voice for example has smearing, the other tracks lack the dynamics of my best CDs (Decca, Mercury Living Presence, BIS, some DG, old CBS/Sony).

nat8808 · 05:12 PM

Chesky used some kind of dbx engineered noise-shaped oversampling in their A/D back in 1989.

Here's journalistic report from some magazine: http://www.technofileonline.com/texts/chesky89.html

abraxalito · 2nd January 2013, 10:16 PM

Yep, Bob Adams designed it when he was at dbx, this became the basis for the UltraAnalog ADC. Later, Bob Adams joined ADI.

24th May 2012, 10:06 AM	#1
stellavox diyAudio Member Join Date: Jan 2007 Location: Oneonta, NY; USA	Anyone have some info on the UltraAnalog DEMO 1 Board? In addition to their well-regarded D20400 DAC module, UltraAnalog also made other A/D modules including an AFE20048 Analog Front End and D20C10 "Decimator". They also made a DEMO 1 board to mount these on - and "play with". I came across the DEMO board and wish to continue "playing". Anyone out there have any info on these other chips or the DEMO board? I've tried searching the web but as others have mentioned; after being sold to Wadia, the company disappeared. Thank You Charles Last edited by stellavox; 24th May 2012 at 10:08 AM.

25th May 2012, 04:46 PM	#2
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	I have some of the chip sets (4 sets I think), but no schematic. There's the front-end chip (not a module), the decimator IC and some 0.01% resistor networks. PM me if interested. __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

26th May 2012, 12:04 PM	#3
stellavox diyAudio Member Join Date: Jan 2007 Location: Oneonta, NY; USA	Thanks Abraxalito Was able to get the A/D board going - now to figure out what to do with it. Has AES and SPDIF digital outputs along with an analog "monitor" output from a D20400 D/A module. Unit was from the Chesky studio. Charles

2nd January 2013, 12:07 AM	#5
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	Chesky's A/D sucks - introduces noise modulation. I didn't notice this until I built my own NOS DAC but now its very obvious on their 'Ultimate Demonstration Disc' - the announcer's voice for example has smearing, the other tracks lack the dynamics of my best CDs (Decca, Mercury Living Presence, BIS, some DG, old CBS/Sony). __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

2nd January 2013, 05:07 PM	#6
nat8808 diyAudio Member Join Date: Aug 2010	Chesky used some kind of dbx engineered noise-shaped oversampling in their A/D back in 1989. Here's journalistic report from some magazine: http://www.technofileonline.com/texts/chesky89.html Last edited by nat8808; 2nd January 2013 at 05:12 PM.


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1st January 2013, 08:02 PM	#4
nat8808 diyAudio Member Join Date: Aug 2010	Wadia produced an A/D studio unit at around the time they bought out Ultraanalog - have seen one on ebay a little while ago. Dan Lavry designed the UltraAnalog stuff - his own company. He MAY be willing to help you out perhaps - he should be contactable via Lavry Engineering website and he also used the gearslutz.com forum sometimes as himself. Interesting bits it sounds like you have. I imagine Chesky Studios would have some very interesting kit, some bespoke/experiemental in the quest for sound quality. Probably a great sounding A/D for recording if now a little limited in format.

2nd January 2013, 10:16 PM	#7
abraxalito diyAudio Member Join Date: Sep 2007 Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though... Blog Entries: 62	Yep, Bob Adams designed it when he was at dbx, this became the basis for the UltraAnalog ADC. Later, Bob Adams joined ADI. __________________ When a measure becomes a target, it ceases to be a good measure. C.A.E. Goodhart

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